34 CHAPTER 1: INTRODUCTIONE1 Digital Line Card The E1 Digital Line Card, used outside of North America, provides E1connectivity using the ISDN PRI protocol. It carries data at a rate of 2.048Mbps and can carry 32 channels, each with 64 Kbps. Thirty of thesechannels are available for calls. Like the T1 ISDN PRI Card, the E1 PRI Cardsupports PRI software features such as DID.The SuperStack 3 NBX system can accommodate up to 24 E1 Digital LineCards (720 channels). The NBX 100 system can accommodate up to 3 E1Digital Line Cards (90 channels). If you connect an E1 Digital Line Cardusing the NBX 100 system backplane, the system can accommodate onlyone card.3C10165D includes an onboard CSU. The 3C10165D can provide CSUperformance statistics, can be enabled for loopback testing, and can beconfigured as a remote device that communicates with its NCP over arouted network.ISDN PRI services require specific circuit provisioning, which you mustobtain before using this card. See Appendix B for more information. formore information.Figure 10 E1 Digital Line Card (3C10165C)Figure 11 E1 Digital Line Card (3C10165D)Each 3C10165C E1 card has the following lights and connectors:■ E1 — This RJ-48C connector makes a connection to an ISDN interfacechannel service unit/data service unit (CSU/DSU).■ Status Lights — These lights indicate the status of the card’ssignaling, synchronization, and loop back test.■ CF — On indicates a Carrier Failure. The E1 card is not receivingcarrier signals from the far end of the E1 line.
